interface StartStop {
	void start();
	void stop();
}
class Huiyi implements StartStop{
	public void start(){
		System.out.println("会议开始了！");
	}
	public void stop(){
		System.out.println("会议结束了！");
	}
}
class Car01 implements StartStop{
	public void start(){
		System.out.println("汽车启动了！");
	}
	public void stop(){
		System.out.println("汽车停止了！");
	}
}
public class Main {
	public static void main(String[] args){
		int i;
		StartStop starstop[]=new StartStop[2];
		starstop[0]=new Huiyi();
		starstop[1]=new Car01();
		for(i=0;i<2;i++)
		{
			starstop[i].start();
			starstop[i].stop();
		}
	}
}